Arrester for sound-producing apparatus.



Witnesses C(Y. CLAWSON. ARRESTER FOR SOUND PRODUCING APPARATUS.

APPLICATIOH man APR-27. m5.

Patented July 4, 1916.

2 SHEETSPSHEET 2.

Attorneys CHESTER Y. cLAws'oN, OF'SALT LAKE cIrY, UTAH.

ARRESTER FOR SOUND-PRODUCING APPARATUS.

Specification of Letters Patent. 1

Patented July 4 1916.

Application filed April 27, 1915. Serial No. 24,275. i p

To all whom it may concern Be it known that I, Crms'rnn Y. CLAWSON, a citizen of the United States, residing at Salt Lake City, in the county of SaltLake and State of Utah, have invented a new and useful Arrester for Sound-Producing Apparatus, of which the following is a specification.

The present invention appertains to an arrester or stopping device for sound producing apparatus, such as phonographs, and aims-to provide novel and improved means for stopping the turn table or record carrier when the needle of the reproducer has reached the end of the sound or phonic groove.

As a specific object, the invention aims to provide a metal member or conductor carried by the record and adapted to close an electrical circuit when the needle reaches the end of the phonic groove, for purpose of actuating the brake lever to brake applying position.

It is also within the scope of the invention to provide an appliance of the nature indicated, which is comparatively simple and inexpensive in construction, which may be readily applied to various sound producing apparatus, and which will be thoroughly eiiicient and practical in use.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein Figure l is a plan view-of a sound producing apparatus embodying the 1mprovements, portions being broken away, and the electrical circuitbeing illustrated diagrammatically. Fig. 2 is a fragmental elevation of the sound producing apparatus embodying the improvements, portions being broken away. Fig. 3 is a reduced plan View of a disk record embodying modified means for closing the electrical circuit. Fig. i is an enlarged section taken on the line 4-4 of Fig. 3.

In the drawings, there is illustrated a sound producing apparatus, the same embodying a turn table or rotatable record carrier 1, and a swinging sound arm 2 having a vertically swingable reproducer '3 at its free end. The reproducer 3 has theusual needle l, and the usual brake lever 5' operates the brake (not shown) for stopping the machine in the usual manner, but since the details of the brake are well known and may be of various constructions, it is not deemed necessary to illustrate or describe the brake in detail. A disk record 6 is removably seated upon the turntable 1, the turn table 1 being carried by the, rotatable spindle or shaft 7, and the record6 having a central aperture 8 for receiving the upper protruding end of the spindle for centering the rec- 0rd in the usual manner. The foregoing parts are common in sound producing apparatus, and need no lengthy description.

In carrying out the invention, a. disk 9 of.

metal or other material which is a conductor of electrical energy, is embedded within the record 6 between the faces thereof, and is provided with acentralaperture 10 register ing or coinciding with the aperture 8 of the record to receive the upper protruding end of the spindle 7 and whereby the disk 9 engages the spindle to be in electrical connection therewith. The record 6 is of insulating material, as usual, and the disk 9 is utilized for closing an electrical circuit when the needle reaches the end of the phonic groove. In order to enable the needle t to engage the disk 9 when the needle reaches the end of the phonic groove, each face of the record 6 is provided With a deep groove 11 extending spirally from the aperture 8 to the endof the phonic groove. The spiral grooves 11 extend in the same directions as the spiral phonic grooves on the faces of the record, and the grooves 11 extend to the disk 9 so that the said disk forms the bottom of the grooves 11 and separates the grooves at the opposite sides of the record-.'.

It will be evident that if the record 6 is only active face. The disk 9 is disposed-com pletely between the faces of the record andbetween the ends of the phonic grooves in the opposite faces of the record, and the disk" 9 being in engagement with the spindle-7'.

will be grounded through the spindle and metallic parts of the motor (not shown).

The electrical circuit includes a. conductor or wire 12 connected to the spindle 7 or 'contact 1 1 and a pair of electromagnets 16,

and a pivoted armature 17 cooperates with the electromagnets and is connected by means of a link 18 with the brake lever 5, whereby when the armature 17 is attracted by the electromagnets 16, the brake lever 5 will be swung to brake applying position. The electroinagnets 16 are connected by means of a conductor or wire 19 with a'battery or other source of electrical energy 20, and said battery is connected by means of a conductor 01' wire 21 with the sound arm 2 which is metallic or a conductor of electrical energy. The disk 9, spindle 7, brake lever 5, contact 14, electromagnet 16, battery 20, sound arm 2, and needle 4: are thus connected in series, and when the needle 4 is removed from the end of the phonic groove, such as when the selection is being played, the record 6 will provide an insulation between the needle 4 and disk 9 for normally opening the circuit.

In operation, when the needle 41 reaches the end of the phonic groove, it will drop into the upper spiral groove 11 and will therefore contact with the disk 9, for closing the circuit through the disk 9, conductor 12,

brake lever 5, contact 14, conductor 15, electromagnets 16, conductor 19, battery 20, conductor 21, sound arm 2, reproducer 3, and needle 4, and the electromagnets 16 being energized will attract the armature 17 and thus swing the lever 5 to brake applying position. This will apply the brake for stopping the turn table 1, and at the same time the brake lever 5, which acts as a switch, will be moved away from the spring contact 14 to open the circuit and reduce to a minimum the amount of current consumed for operating the brake device. It is of course understood that each of the records employed in connection with the sound producing apparatus is equipped witlra disk or conductor 9 for closing the electrical circuit when the needle reaches the end of the phonic groove. As an auxilizn-y or secondary means for stopping the turn table, atontact finger 22 is secured to the heel oi the sound arm 2. and cooperates with a spring contact 23 which is connected by means of a conductor or wire 2% to the conductor 15. The contact finger 212, spring contact conductor 24, electromagnets 16, conductor 19, battery 20, and conductor '21 are thus connected in series. In other words, the con-- tact finger 22, spring contact 23 and conductor 24. form a shunt connected to the main circuit, whereby when the sound arm- 2 is swung sutlicicntly by reason of the needle 1 reaching the end of the phonic groove, the contact finger 22 will engage the spring con tact 23 for closii'ig the circuit through the conductor 21, electromagnets 16, conductor 19, battery 20, conductor 21, contact finger 22, and spring contact 23. This will attract the armature 1? and swing the lever 5 to brake applying position. As a result, if the main circuit is not closed for any reason whatever, the secondary circuit will be closed for operating the brake properly. Attention is directed to the fact that the spiral groove 11 will receive the needle 1 when it reaches the end of the phonic groove and will carry the needle iinwardly or toward the spindle 7 for forcibly swinging the arm 2 to bring the contact finger thereof into engagement with the spring contact 23 for closing the secondary circuit. The spiral groove 11 thus serves the dual function in exposing the contact disk 9 to the needle 4, and of carrying the needle 4 inwardly so that the secondary circuit will be closed it the primary circuit is not closed. The secondary circuit may be employed independently of the primary. circuit, and as illustrated the two circuits have the common electromagnets 16 and battery 20.

In the modification illustrated in Figs. 3 and a, the dish record (3 having the central aperture 8 to engage the spindle of the sound producing apparatus,'is provided with different means for closing the electrical circuit. Thus, a radial metallic strip 9' is cur bedded in the record flush with each face thereof, the inner ends of the strips 9 having eyes i)" surrounding the aperture 8', and the outer ends oi the strips 9 having arcuate contacts 9' eXtcnding along the end convolutions of the phonic grooves. The strips 9' projectin opposite directions to balance the record. hen the record 6 is applied to the spindle of the machine upon the turn table, the upper strip 9 will be brought into slew trical uamcction with the spindle due to the eye 9 en'ibrar' 1;; the spindle, and when the needle ot the reproducer reaches the end of the phonic groove it willengage the upper contact 9 for cl 4 uc electrical circuit, as will be a parent t :am the foregoing.

hat is claimed is:

The combination withv a turn table, av spindle carryingthe same, a brake applying 5 device for stopping the turn table, a member of insulating material seated upon said turn table, and a swinging arm having an element toiide upon said member and move toward said spindle, of a disk embedded in aid member and having an aperture to receive said spindle whereby the disk engages the spindle, and an electrical circuit terminally connected to said element and spindle and including a source of electrical said element and extendlng to said disk and aperture whereby the disk forms the bottom of said groove upon which said element rides. r

y In testimony that I claim the foregoing as w my own, I have hereto aflixed my signature 10 in the presence of two witnesses.

CHESTER Y. CLAWSON.

Witnesses:

SHIRLEY Y. CLAWSON, L. GRANT Fox. 

